[原] 各类粮食作物通称谷物。
[误] Any of various types of grain plants is generally called corns.

[正] Any of various types of grain plants is generally called corn.

[注] 名词 corn 可作“谷物”、“玉米”解，只用单数，如：There is a field of corn in front of the village. 村前有一块玉米田。/Corn is used as food for people and farm animals. 谷物用作人、畜的食料。